1. Given n=10, x =28, s=2.0, 99% confidence. Assuming that the samples come from a normal distribution, find the interval estimate of the population mean.

a.(11.34, 14.89)

b.(1.63, 2.25)

c.(26.36, 29.63)

d.(21.36, 24.63)

2. Given n=400, x =50, s=3.0, 90% confidence. Assuming that the samples come from a normal distribution, find the upper bound of the interval estimate of the population mean.

Round off to two decimal places.

a. None of the choices

b. 50.25

c. 67.60

d. 50.01

3. Determine the 95% confidence interval if you have a sample mean of 120, standard deviation of 5 and sample size of 100.

Round off to two decimal places.

a. (119.59, 120.02)

b. None of the choices

c. (119.59, 120.41)

d. (119.98, 120.02)